Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number LM137KB-B found under Microcircuit Linear by E2v Inc. The National Stock Number assigned to this part is 5962011156140, and the Federal Supply Class is 5962 Microcircuits Electronic. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like LM137KB-B.